Zoey and her friends challenge some stuck-up computer geeks to a robot battle, and recruit Quinn for her expertise. It seems that a win is guaranteed until she overhears Logan making fun of her behind her back, and quits the team. With nobody to help them build their robot, the kids are forced to ask the smartest boy in the school for help, who will only do so on the condition that Nicole goes on a date with him.

The gang is invited to Logan's dad's mansion for spring break, only to find out they are being used for testing a new reality show called "Gender Defenders." Now it's boys against girls and, when Chase accidentally sends a text message to Zoey proclaiming his true feelings for her, they start to wonder if it's Spring Break or Spring Bummer.

Sushi Rox, one of the most popular restaurants in PCA, catches fire and hits the ground. Zoey doesn't want to go on knowing Kazu, the owner of the restaurant, is heartbroken and really loved working there. So, she puts on a People Auction, having her and her friends do various chores to help raise money for Sushi Rox.

It's a brand new year at PCA, but everybody learns that Nicole had to go to an all girls' school (has boy crazy syndrome). The bad news is that they are losing their roommate. Zoey and Lola are worried about Quinn being their roommate, because of Quinn's doing all of these weird experiments. What else can go wrong? Zoey gets a whole new surprise, when she finds Chase doing something she didn't want to see.

For Psychology class, Zoey and the gang write their deepest secrets out and tie them to balloons.

Zoey is heading out of campus to meet J.T. Hawthorne, but when her supposed driver is about to have a baby, she asks Coco to drive her instead. However, things get complicated when Coco needs a favor from Michael, who again needs a favor from Stacey, who again needs a favor from Logan, who again needs a favor from Dustin, who again needs a favor from Lola, who again needs a favor from Chase, who again needs a favor from Zoey and Lola, who again need a favor from the nerd group, who again need a favor from Quinn, making a complete favor chain, where all threads has to work perfectly. Meanwhile, Chase shows unexpected knowledge of comic books, so the nerd group stalk him around campus because they now see an opportunity to hang out with someone popular.

Logan buys a car which is worth 327,000 dollars with his dad's credit card, even though he is not allowed to drive, so he can make out with girls in it. But when his dad finds out, he is furious and strips him of everything related to money, including chequebooks and credit cards, and also all the stuff he bought for it, like the plasma screen, the laptop and the stereo. Now Logan has to learn to live without money for the first time in his life. Meanwhile, Michael bets Mark and Quinn that he can escape from being tied up in ropes, no matter how they do it.

After Quinn and Mark agree to give each other some one off, she sees him with another girl and becomes jealous; changing her whole look to in him back:

The gang is surprised to find that former bully Vince Blake is back at PCA.

The end of the school year is approaching, and that means prom is too!

New students attend PCA and have an opportunity to find out about their new school. The new students take turns in asking Chase and Zoey questions as they reflect on their memories during their time at PCA.